EFFECT OF INCLINED CONDUCTIVITY ANISOTROPY ON FREQUENCY INDUCTION AND TEM DATA
M.I. Epova, E.Yu. Antonova, and A.I. Fedorovb
a A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
b BAKER HUGHES 2001 Rankin Road, P.O. Box 1407 (77251-1407) Houston, TX 77073-5100, USA
Keywords: Anisotropy, conductivity, surface resistivity survey, frequency induction sounding, TEM
Pages: 317-321
Abstract
The harmonic electromagnetic field of a vertical magnetic dipole above an anisotropic half-space has been simulated using a forward algorithm for layered conductive media with inclined anisotropy. Inclined anisotropy has been found out to change the typical behavior of frequency and transient responses. Qualitative interpretation of FD loop-loop responses of a conducting earth with inclined anisotropy requires taking into account the receiver azimuth dependence of apparent resistivities. In the case of time-domain measurements, this dependence is absent but the apparent resistivities are higher at late times.
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